Malicious PDF — malware analysis report

Static analysis result for SHA-256 537cfce18b10f315…

MALICIOUS

PDF

41.4 KB Created: 2021-05-17 03:17:01 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: abd513b61ff7a079e1915ee37460dd1d SHA-1: c8d855154496c9ea209123a5aa0c826183b6bcd8 SHA-256: 537cfce18b10f3153b303400d4bee3095e98a421500e6ae3eb31957600a7385a
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of external links, forming a link farm, with one prominent URL pointing to a potential game hack download. The ML classifier also flagged this PDF as malicious. While no scripts were directly executed, the structure and embedded links suggest an attempt to redirect users to malicious or deceptive content, likely as part of a phishing or scam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 4

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://netcdn.xyz/app/431946152/rbx-hut-game-hack PDF link annotation
    • http://pietroubaldi.org.br/images/how-do-you-get-roebucks_GM431946152.pdfIn PDF document text
    • http://pietroubaldi.org.br/images/coin-master-cheats-and-hacks_GM406889139.pdfIn PDF document text
    • http://pietroubaldi.org.br/images/free-robux-without-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://pietroubaldi.org.br/images/boost9-com-roblox-hack_GM431946152.pdfIn PDF document text
    • http://pietroubaldi.org.br/images/free-robux-no-verification-no-download_GM431946152.pdfIn PDF document text
    • http://pietroubaldi.org.br/images/coin-master-gift-hack_GM406889139.pdfIn PDF document text
    • http://pietroubaldi.org.br/images/coin-master-hack-apk-download-2021_GM406889139.pdfIn PDF document text
    • http://pietroubaldi.org.br/images/how-to-get-minecraft-for-free-on-xbox-one_GM479516143.pdfIn PDF document text
    • http://pietroubaldi.org.br/images/play-coin-master-for-free_GM406889139.pdfIn PDF document text
    • http://pietroubaldi.org.br/images/free-coin-master-account_GM406889139.pdfIn PDF document text
    • http://pietroubaldi.org.br/images/free-gifts-coin-master_GM406889139.pdfIn PDF document text
    • http://pietroubaldi.org.br/images/free-robux-wheel_GM431946152.pdfIn PDF document text
    • http://pietroubaldi.org.br/images/roblox-free-robux-codes_GM431946152.pdfIn PDF document text
    • http://pietroubaldi.org.br/images/coin-master-spin-link-today_GM406889139.pdfIn PDF document text
    • http://pietroubaldi.org.br/images/how-can-i-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://pietroubaldi.org.br/images/free-coins-and-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://pietroubaldi.org.br/images/hack-robux_GM431946152.pdfIn PDF document text
    • http://pietroubaldi.org.br/images/how-you-get-free-robux_GM431946152.pdfIn PDF document text
    • http://pietroubaldi.org.br/images/coin-master-hack-xyz-download-free_GM406889139.pdfIn PDF document text
    • http://pietroubaldi.org.br/images/coin-master-free-soins_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off000047de.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x47DE 24864 bytes
SHA-256: 85a3459fe817a305345fdfdd5b5d84d33b7a6d861f9f06b1bc2900ebab3efc18
font_01_sfnt_off000080c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x80C1 17812 bytes
SHA-256: e24951961dffee7128ae3d90f7f1153dbc58b347b85dc2bf38d5c1c57fa85777

Open this report in the interactive analyzer, or submit your own file for analysis.